USAID -Washington, DC, US,
« Evaluating rainfall catchments », vol. no. RWS.1.P.5. USAID, Washington, DC, USA, p. 8 p.: 4 fig., 1982.
E. J. Schiller,
« Rooftop rainwater catchment systems for drinking water supply », in
Water supply and sanitation in developing countries, 1982, p. P. 85-100 : 12 fig.